“TMZ After Dark” was fully star-charged Saturday night … two buses, double the chaos, and enough energy to power Sunset — with the first bus led by Nick Cannon’s brothers!

Hit the clip … ’cause Gabriel, Caleb and Reuben were dancing, singing and hyping up the crowd like it was a family reunion on wheels, all soundtracked by DJ Blue as the night launched at The Burgundy Room — one of Hollywood’s oldest, most iconic venues.

The crew then pulled up at Beaches WeHo, and then cranked things all the way up at Saddle Ranch Chop House — where pink gummy shots were flying and the mechanical bull was getting a serious workout.

Over on bus two, Ice Cube‘s longtime protégée Yo-Yo came bearing gifts for the whole squad and delivered arena-level performances right there in the aisle, powered by DJ NV.